Internal Cast Iron Hydraulic Gear Pump: Efficient And Reliable Hydraulic Power Solution
Fairy Deer Benefits Of Internal Cast Iron Hydraulic Gear Pump
Internal Gear Meshing Design: Utilizes the internal and external gear meshing principle where the inner gear drives the outer gear, separated by a crescent-shaped partition, ensuring smooth fluid intake and discharge.
High Strength Cast Iron Construction: Provides durability and noise reduction through unique internal silencing designs, resulting in ultra-low noise operation even at high pressures.
Axial and Radial Pressure Compensation: Maintains high volumetric efficiency at low speeds and low viscosity conditions, ensuring stable flow and pressure output.
Wide Operating Range: Supports speeds up to 3000–3500 rpm and pressures up to 25–35 MPa, suitable for demanding industrial environments.
Long Service Life: Low relative sliding speed between gears reduces wear and extends pump life; resistant to oil contamination.
Flexible Combination Options: Pumps can be combined into dual units with floating spline couplings for stable operation and space-saving installation.
Energy Efficiency: Particularly effective in servo-driven and variable frequency systems, greatly reducing energy waste compared to traditional fixed displacement pumps.
COMPARISON
Strength and Pressure Resistance:
Cast iron pumps withstand higher pressures (up to 20-24MPa), suitable for heavy-duty industrial applications, while aluminum pumps typically handle pressures below 16MPa, limiting their use in high-pressure systems.
Wear Resistance and Longevity:
Cast iron offers superior wear resistance and longer service life, ideal for abrasive or contaminated fluids. Aluminum’s softer nature leads to faster wear and higher maintenance.
Noise and Vibration:
Cast iron pumps feature internal noise reduction designs for quieter operation, whereas aluminum pumps may generate more vibration due to lower rigidity.
Thermal Performance:
Aluminum’s better heat dissipation suits lighter loads, but cast iron’s higher temperature tolerance ensures stability in harsh environments.
Cost Efficiency:
Although aluminum pumps have lower upfront costs and lighter weight, cast iron pumps provide better long-term value through durability and reliability in demanding industrial settings.
For customers seeking robust, efficient, and long-lasting hydraulic solutions, Internal Cast Iron Hydraulic Gear Pumps represent the optimal choice to ensure system reliability, reduce downtime, and maximize operational efficiency.
Smooth Operation & Noise:
Helical tooth pumps engage gradually with angled teeth, reducing vibration and noise for quieter operation; straight tooth pumps have higher noise due to abrupt tooth engagement.
Flow Pulsation & Efficiency:
Helical design ensures minimal flow pulsation and higher volumetric efficiency, enhancing system stability; straight tooth pumps exhibit more pulsation affecting precision.
Load Capacity & Durability:
Helical teeth provide greater contact area, stronger load capacity, and longer service life; straight teeth have less contact area, leading to faster wear.
Compactness & Manufacturing:
Helical pumps are compact but require complex machining; straight tooth pumps are simpler and cheaper to produce.
Application Suitability:
Helical pumps suit high-demand, noise-sensitive, and high-pressure industrial applications; straight tooth pumps fit lighter-duty, cost-sensitive uses.
For customers seeking reliable, efficient, and durable hydraulic solutions, Internal Helical Tooth Hydraulic Gear Pumps offer superior performance and long-term value in demanding industrial environments.
Comparison of structural design and fluid adaptability:
The internal meshing hydraulic gear pump adopts the meshing structure of internal gear and external gear, and a crescent-shaped partition is used to form a sealed chamber in the middle. The gear meshing process is gradual and smooth, and can handle ultra-wide viscosity range fluids from 1cP to 1,000,000cP (such as silicone, asphalt, high-temperature molten salt). The external meshing pump relies on the meshing of two parallel external gears with a fixed gap, which is more suitable for low-viscosity fluids (such as lubricating oil and fuel oil). The viscosity range is usually 1-100,000cP, and the efficiency is easily reduced due to leakage under high pressure.
Comparison of pressure and flow performance:
Due to the double bearing support structure, the external meshing pump can withstand a high pressure of 2500 PSI, which is suitable for precision high-pressure scenarios such as hydraulic systems. Although the internal meshing pump has a lower working pressure (about 1500 PSI), its adjustable gap design and progressive meshing characteristics can achieve a smoother flow output (pulsation rate is reduced by 30%-50%), which is particularly suitable for shear-sensitive fluids (such as resins and coatings).
Wear resistance and maintenance cost comparison:
The internal meshing pump contains only two moving parts (rotor + idler), and the gear contact area is large, the wear rate is low, and the maintenance cycle is extended by 40%-60%. The external meshing pump has a complex structure (including gears, bearings, seals, etc.), and is easy to wear in media containing solid particles (such as waste oil, filled polymers), and the maintenance frequency is increased. For example, when the internal meshing pump handles waste oil containing 5% abrasive particles, the service life can be up to 2 times that of the external meshing pump.
Temperature and working condition adaptability comparison:
The internal meshing pump can withstand 800°F (427°C) high-temperature fluids (such as molten metal, hot oil) due to adjustable clearance, while the external meshing pump is usually limited to below 300°F (149°C). In addition, the bidirectional rotation design of the internal meshing pump supports forward and reverse fluid transportation, and can flexibly respond to production needs without modifying the pipeline.
Noise and energy consumption comparison:
The helical or involute tooth design of the internal meshing pump reduces meshing impact, and the noise during operation is 10-15 decibels lower than that of the external meshing pump, which is suitable for noise-sensitive production environments (such as food processing workshops). Its self-priming ability and volumetric efficiency of more than 95% can reduce the risk of idling and reduce energy consumption by 20%-30%.
Internal hydraulic gear pumps have become the preferred choice in the chemical, food processing and high-temperature fluid processing fields due to their ultra-wide viscosity adaptability, low maintenance cost, high temperature tolerance and stable flow output. Although external gear pumps perform well in high-pressure scenarios, they are limited by structural complexity and wear resistance, and are more suitable for precision hydraulic systems with low viscosity and clean fluids. If customers need to handle high-viscosity, impure or high-temperature media, internal hydraulic gear pumps will significantly reduce the overall operating costs and improve system reliability.
Recommended Internal Cast Iron Gear Pump
Single Gear Pump For KOMATSU PC75UU-2 Excavator
Double Gear Pump For CATERPILLAR E305.5 E306 E308 Excavator
Triple Gear Pump For KOMATSU 3-5 Ton Excavator
Internal Cast Iron Hydraulic Gear Pumps - Diverse Industries Including Chemical Processing, Food And Beverage...
Discover Our Internal Cast Iron Hydraulic Gear Pumps, engineered for diverse industrial sectors including chemical processing, food and beverage, pharmaceuticals, oil and gas, and heavy machinery. Experience reliable, energy-efficient pumping with smooth, low-pulsation flow and robust wear resistance—ideal for handling viscous, abrasive, or corrosive fluids in demanding environments.
Construction Machinery - Excavator
Drive hydraulic actuators (such as excavator arms and buckets) to achieve precise power control.
Construction Machinery - Concrete Pump Truck
Drive concrete delivery systems to ensure stable pumping of high-pressure slurry.
Agricultural Machinery - Tractor
Control the hydraulic power output of suspension systems and agricultural implements (such as plows and seed drills)
Industrial Machinery - Machine Tool
Drive hydraulic chuck, workpiece clamping and automatic tool changing system.
Marine & Offshore - Deck Machinery
Drive anchor winch, winch and hatch opening and closing system.
Marine & Offshore - Steering Gear
Provide high-pressure hydraulic power required for ship steering.
Energy Sector - Hydropower Plant
Drive the gate opening and closing and turbine speed control device.
Metallurgy & Mining - Rolling Mill
Drive rollers to form metal sheets.
Petrochemical - Drilling Rig
Control drill bit rotation and downhole pressure balance system.
Petrochemical - Pipeline Tester
Generate high-pressure liquid for pipeline sealing detection.
Forestry Machinery - Harvester
Drive sawing, grabbing and wood conveying mechanisms.
Forestry Machinery - Log Loader
Control hydraulic arms to load and unload wood.
FAQs
High durability: Cast iron is wear-resistant and impact-resistant, suitable for heavy loads and long-term operation.
Compact design: The internal meshing structure is small in size and saves installation space.
Cost-effectiveness: Compared with plunger pumps, it has low maintenance costs and high cost-effectiveness.
Applicable media: mineral oil, water glycol, low-corrosive synthetic oil;
Unsuitable scenarios: strong acid/alkaline media or high-water content fluids require special coatings.
Regular maintenance: Check the filter every 500 hours to prevent particulate matter from entering;
Oil temperature control: Keep the oil temperature ≤80°C to prevent overheating and seal aging.
Check the cause: cavitation, low oil viscosity or bearing wear;
Solution: Increase the suction port pressure, replace the appropriate viscosity oil or replace the worn parts.
Key parameters: maximum pressure (such as 20MPa), displacement range (1-100cc/rev), speed (1500-3000rpm) (Keywords: pressure rating, displacement range);
Scenario adaptation: high-pressure type for construction machinery and low-noise type for machine tools.
Temperature limit: conventional cast iron pumps can withstand temperatures from -20°C to 120°C;
High temperature solution: over 120°C, high temperature seals must be customized or nickel alloy materials must be used.
Customizable options: special interfaces (SAE/ISO flanges), anti-corrosion coatings, high-precision gear sets;
Service process: provide working condition analysis → 3D design confirmation → prototype testing → mass production.
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